Fix some typos

Fix typos and common misspellings in code comments and in the manual.

Change-Id: I46fc9d424620c77ae9ccf78b58081bd303386d7c
diff --git a/doc/handover.txt b/doc/handover.txt
index ac19e87..c5fc331 100644
--- a/doc/handover.txt
+++ b/doc/handover.txt
@@ -38,7 +38,7 @@
 
 Window RXLEV averaging:		10 SACCH frames (no weighting)
 Window RXQUAL averaging:	1 SACCH frame (no averaging)
-Level Threashold:		1 of the last 1 AV-RXLEV values < -110dBm
+Level Threshold:		1 of the last 1 AV-RXLEV values < -110dBm
 Quality Threshold:		3 of the last 4 AV-RXQUAL values >= 5
 Interference Threshold:		1 of the last AV-RXLEV > -85 dBm &
 				3 of the last 4 AV-RXQUAL values >= 5